CLASS REPTILIA: THE SNAKES, LIZARDS, TURTLES, CROCODILES, ETC. EXAMPLE: THE GARTER SNAKE (THAMNOPHIS SP.) [Laboratory exercise]. Structure, 303.--Life-history and habits, 308. OTHER REPTILES. Body form and organization, 310.--Structure, 311.--Life-history and habits, 312.--Classification, 313.--Tortoises and turtles (Chelonia), 314.--Snakes and lizards (Squamata), 317.--Crocodiles and alligators (Crocodilia), 325. XXVII.--BRANCH CHORDATA (CONTINUED). CLASS AVES: THE BIRDS. EXAMPLE: THE ENGLISH SPARROW (PASSER DOMESTICUS) [Laboratory exercise]. External structure, 327.--Internal structure [Laboratory exercise], 329.--Life history and habits, 335. OTHER BIRDS. Body form and structure, 336.--Development and life-history, 339.--Classification, 340.--The ostriches, cassowaries, etc. (Ratitæ), 341.--The loons, grebes, auks, etc. (Pygopodes), 343.--The gulls, terns, petrels, and albatrosses (Longipennes), 345.--The cormorants, pelicans, etc. (Steganopodes), 346.--The ducks, geese, and swans (Anseres), 347.--The ibises, herons, and bitterns (Herodiones), 347.--The cranes, rails, and coots (Paludicolæ), 348.--The snipes, sand-pipers, plovers, etc. (Limicolæ), 349.--The grouse, quail, pheasants, turkeys, etc. (Gallinæ), 358.--The doves and pigeons (Columbæ), 351.--The eagles, hawks, owls, and vultures (Raptores), 351.--The parrots (Psittaci), 353.--The cookoos and kingfishers (Coccyges), 354.--The woodpeckers (Pici), 354.--The whippoorwills, chimney-swifts, and humming-birds (Macrochires), 356.--The perchers (Passeres), 357.--Determining and studying the birds of a locality, 359.--Bills and feet, 362.--Flight and songs, 364.--Nestling and care of the young, 366.--Local distribution and migration, 367.--Feeding habits, economics, and protection of birds, 370. XXVIII.--BRANCH CHORDATA (CONTINUED). CLASS MAMMALIA: THE MAMMALS. EXAMPLE: THE MOUSE (MUS MUSCULUS) [Laboratory exercise]. Structure, 373.--Life-history and habits, 379. OTHER MAMMALS. Body form and structure, 381.--Development and life-history, 387.--Habits, instincts, and reason, 387.--Classification, 388.--The opossums (Marsupialia), 389.--The rodents or gnawers (Glires), 390.--The shrews and moles (Insectivora), 391.--The bats (Chiroptera), 391.--The dolphins, porpoises, and whales (Cete), 393.--The hoofed mammals (Ungulata), 394.--The carnivores (Feræ), 396.--The man-like mammals (Primates), 398. PART III ANIMAL ECOLOGY XXIX.--THE STRUGGLE FOR EXISTENCE, ADAPTATION, AND SPECIES-FORMING. The multiplication and crowding of animals, 404.--The struggle for existence, 406.--Variation and natural selection, 406.--Adaptation and adjustment to surroundings, 407.--Species forming, 408.--Artificial selection, 409. XXX.--SOCIAL AND COMMUNAL LIFE, COMMENSALISM, AND PARASITISM.